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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1621bb23223ea8c464ab9382eb770c18cc29fbeaee1188829558203c0676bc1d' 
  AND token = 'dkL/97mVDpVrQzzg0xPl5yT9j1/G3cOHbDtnHHg9wOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}